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Of 1171 isolates of Escherichia coli isolated from urine samples at the Public Health Laboratory, Toronto, Ontario, Canada, between May 1990 and December 1991, 120 (10.3%) were resistant to trimethoprim (TMP), cotrimoxazole (TMP/SMX), sulfamethoxazole (SMX) and other antimicrobial agents; 110 of the 120 isolates (91.7%) were resistant to four or more agents. The majority of resistant isolates (91.7%) exhibited high-level resistance (MIC &gt; 1000 mg/L) to TMP. The MIC of TMP/SMX for all 120 isolates was &gt; 2.0/38.0 mg/L and for SMX &gt; 1024 mg/L. High-level resistances were also present among the beta-lactam antimicrobials with MICs ranging from 16- &gt; 256 mg/L. Forty-three of 120 TMP-resistant (35.8%) isolates conjugally transferred TMP-resistance to E. coli K-12. Co-transfer of several other resistances was observed. SMX cotransferred from 86% of the 43 donors and beta-lactams together with SMX cotransferred from 70%. Nalidixic acid resistance was present among 22 (18.3%) of the 120 resistant isolates, however, nalidixic acid resistance was not transferred to E. coli K-12.

Transferable high-level trimethoprim resistance among isolates ofEscherichia colifrom urinary tract infections in Ontario, Canada